From 1181dc9c2e8df44055bf080731f8abdd6207bc56 Mon Sep 17 00:00:00 2001
From: barthess <barthess@yandex.ru>
Date: Sun, 28 Jun 2015 17:18:39 +0300
Subject: Memtest code moved to 'various' directory

---
 os/various/memtest.cpp | 286 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 286 insertions(+)
 create mode 100644 os/various/memtest.cpp

(limited to 'os/various/memtest.cpp')

diff --git a/os/various/memtest.cpp b/os/various/memtest.cpp
new file mode 100644
index 0000000..49828ec
--- /dev/null
+++ b/os/various/memtest.cpp
@@ -0,0 +1,286 @@
+/*
+    ChibiOS/RT - Copyright (C) 2013-2014 Uladzimir Pylinsky aka barthess
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdlib.h>
+
+#include "memtest.hpp"
+
+/*
+ *
+ */
+template <typename T>
+class Generator {
+public:
+  Generator(void) : pattern(0) {;}
+  virtual T get(void) = 0;
+  virtual testtype get_type(void) = 0;
+  virtual void init(T seed) {
+    pattern = seed;
+  }
+protected:
+  T pattern;
+};
+
+/*
+ *
+ */
+template <typename T>
+class GeneratorWalkingOne : public Generator<T> {
+  T get(void) {
+    T ret = this->pattern;
+
+    this->pattern <<= 1;
+    if (0 == this->pattern)
+      this->pattern = 1;
+
+    return ret;
+  }
+
+  testtype get_type(void) {
+    return MEMTEST_WALKING_ONE;
+  }
+};
+
+/*
+ *
+ */
+template <typename T>
+class GeneratorWalkingZero : public Generator<T> {
+  T get(void) {
+    T ret = ~this->pattern;
+
+    this->pattern <<= 1;
+    if (0 == this->pattern)
+      this->pattern = 1;
+
+    return ret;
+  }
+
+  testtype get_type(void) {
+    return MEMTEST_WALKING_ZERO;
+  }
+};
+
+/*
+ *
+ */
+template <typename T>
+class GeneratorOwnAddress : public Generator<T> {
+  T get(void) {
+    T ret = this->pattern;
+    this->pattern++;
+    return ret;
+  }
+
+  testtype get_type(void) {
+    return MEMTEST_OWN_ADDRESS;
+  }
+};
+
+/*
+ *
+ */
+template <typename T>
+class GeneratorMovingInv : public Generator<T> {
+  T get(void) {
+    T ret = this->pattern;
+    this->pattern = ~this->pattern;
+    return ret;
+  }
+
+  testtype get_type(void) {
+    if ((this->pattern == 0) || ((this->pattern & 0xFF) == 0xFF))
+      return MEMTEST_MOVING_INVERSION_ZERO;
+    else
+      return MEMTEST_MOVING_INVERSION_55AA;
+  }
+};
+
+/*
+ *
+ */
+template <typename T>
+class GeneratorMovingInvRand : public Generator<T> {
+public:
+  GeneratorMovingInvRand(void) : step(0), prev(0){;}
+  void init(T seed) {
+    srand(seed);
+    step = 0;
+    prev = 0;
+  }
+
+  T get(void) {
+    T ret;
+    T mask = -1;
+    if ((step & 1) == 0) {
+      ret = rand() & mask;
+      prev = ret;
+    }
+    else {
+      ret = ~prev & mask;
+    }
+    step++;
+
+    return ret;
+  }
+
+  testtype get_type(void) {
+    return MEMTEST_MOVING_INVERSION_RAND;
+  }
+
+private:
+  size_t step;
+  T prev;
+};
+
+/*
+ *
+ */
+template <typename T>
+static void memtest_sequential(memtest_t *testp, Generator<T> &generator, T seed) {
+  const size_t steps = testp->size / sizeof(T);
+  size_t i;
+  T *mem = static_cast<T *>(testp->start);
+
+  /* fill ram */
+  generator.init(seed);
+  for (i=0; i<steps; i++)
+    mem[i] = generator.get();
+
+  /* read back and compare */
+  generator.init(seed);
+  for (i=0; i<steps; i++) {
+    if (mem[i] != generator.get()) {
+      testp->ecb(testp, generator.get_type(), i*sizeof(T));
+      return;
+    }
+  }
+}
+
+template <typename T>
+static void walking_one(memtest_t *testp) {
+  GeneratorWalkingOne<T> generator;
+  memtest_sequential<T>(testp, generator, 1);
+}
+
+template <typename T>
+static void walking_zero(memtest_t *testp) {
+  GeneratorWalkingZero<T> generator;
+  memtest_sequential<T>(testp, generator, 1);
+}
+
+template <typename T>
+static void own_address(memtest_t *testp) {
+  GeneratorOwnAddress<T> generator;
+  memtest_sequential<T>(testp, generator, 0);
+}
+
+template <typename T>
+static void moving_inversion_zero(memtest_t *testp) {
+  GeneratorMovingInv<T> generator;
+  T mask = -1;
+  memtest_sequential<T>(testp, generator, 0);
+  memtest_sequential<T>(testp, generator, 0xFFFFFFFF & mask);
+}
+
+template <typename T>
+static void moving_inversion_55aa(memtest_t *testp) {
+  GeneratorMovingInv<T> generator;
+  T mask = -1;
+  memtest_sequential<T>(testp, generator, 0x55555555 & mask);
+  memtest_sequential<T>(testp, generator, 0xAAAAAAAA & mask);
+}
+
+template <typename T>
+static void moving_inversion_rand(memtest_t *testp) {
+  GeneratorMovingInvRand<T> generator;
+  T mask = -1;
+  memtest_sequential<T>(testp, generator, testp->rand_seed & mask);
+}
+
+/*
+ *
+ */
+static void memtest_wrapper(memtest_t *testp,
+                            void (*p_u8)(memtest_t *testp),
+                            void (*p_u16)(memtest_t *testp),
+                            void (*p_u32)(memtest_t *testp)) {
+  switch(testp->width) {
+  case MEMTEST_WIDTH_32:
+    p_u8(testp);
+    p_u16(testp);
+    p_u32(testp);
+    break;
+  case MEMTEST_WIDTH_16:
+    p_u8(testp);
+    p_u16(testp);
+    break;
+  case MEMTEST_WIDTH_8:
+    p_u8(testp);
+    break;
+  }
+}
+
+/*
+ *
+ */
+void memtest_run(memtest_t *testp, uint32_t testmask) {
+
+  if (testmask & MEMTEST_WALKING_ONE) {
+    memtest_wrapper(testp,
+        walking_one<uint8_t>,
+        walking_one<uint16_t>,
+        walking_one<uint32_t>);
+  }
+
+  if (testmask & MEMTEST_WALKING_ZERO) {
+    memtest_wrapper(testp,
+        walking_zero<uint8_t>,
+        walking_zero<uint16_t>,
+        walking_zero<uint32_t>);
+  }
+
+  if (testmask & MEMTEST_OWN_ADDRESS) {
+    memtest_wrapper(testp,
+        own_address<uint8_t>,
+        own_address<uint16_t>,
+        own_address<uint32_t>);
+  }
+
+  if (testmask & MEMTEST_MOVING_INVERSION_ZERO) {
+    memtest_wrapper(testp,
+        moving_inversion_zero<uint8_t>,
+        moving_inversion_zero<uint16_t>,
+        moving_inversion_zero<uint32_t>);
+  }
+
+  if (testmask & MEMTEST_MOVING_INVERSION_55AA) {
+    memtest_wrapper(testp,
+        moving_inversion_55aa<uint8_t>,
+        moving_inversion_55aa<uint16_t>,
+        moving_inversion_55aa<uint32_t>);
+  }
+
+  if (testmask & MEMTEST_MOVING_INVERSION_RAND) {
+    memtest_wrapper(testp,
+        moving_inversion_rand<uint8_t>,
+        moving_inversion_rand<uint16_t>,
+        moving_inversion_rand<uint32_t>);
+  }
+}
+
-- 
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